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authorAaro Koskinen <aaro.koskinen@iki.fi>2013-07-21 03:30:11 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-08-11 18:35:20 -0700
commit3d67947d3a8ecd73a811e56613cc33d0a2126584 (patch)
tree1d184dbaa6a0866e0836b376ff0cec38e5cc3c25 /drivers/macintosh
parent0a73f943a52c70cc33b29306433fb11cd9a854fc (diff)
powerpc/windfarm: Fix noisy slots-fan on Xserve (rm31)
commit fe956a1d4081ce1a959f87df397a15e252201f10 upstream. slots-fan on G5 Xserve is always running at full speed with windfarm_rm31 driver, resulting in a very high acoustic noise level. It seems the fan parameters are incorrect, and have been copied from the Drive Bay fan (RPM, not present on rm31) of the legacy therm_pm72 driver. This patch changes the parameters to match the Slots fan (PWM) of therm_pm72. With the patch, slots-fan speed drops from 99% to 19% during normal use, and slots-temp settle to ~42'C. Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/macintosh')
-rw-r--r--drivers/macintosh/windfarm_rm31.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/drivers/macintosh/windfarm_rm31.c b/drivers/macintosh/windfarm_rm31.c
index 0b9a79b2f48..82fc86a90c1 100644
--- a/drivers/macintosh/windfarm_rm31.c
+++ b/drivers/macintosh/windfarm_rm31.c
@@ -439,15 +439,15 @@ static void backside_setup_pid(void)
/* Slots fan */
static const struct wf_pid_param slots_param = {
- .interval = 5,
- .history_len = 2,
- .gd = 30 << 20,
- .gp = 5 << 20,
- .gr = 0,
- .itarget = 40 << 16,
- .additive = 1,
- .min = 300,
- .max = 4000,
+ .interval = 1,
+ .history_len = 20,
+ .gd = 0,
+ .gp = 0,
+ .gr = 0x00100000,
+ .itarget = 3200000,
+ .additive = 0,
+ .min = 20,
+ .max = 100,
};
static void slots_fan_tick(void)